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	<title>Comments on: Woofcast #268</title>
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	<link>http://www.whiteroofradio.com/woofcast-268/</link>
	<description>MINI Cooper Podcasting with db, Todd &#038; Gabe</description>
	<lastBuildDate>Wed, 10 Mar 2010 20:11:42 +0000</lastBuildDate>
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		<title>By: Norman Nelson</title>
		<link>http://www.whiteroofradio.com/woofcast-268/comment-page-1/#comment-43489</link>
		<dc:creator>Norman Nelson</dc:creator>
		<pubDate>Tue, 09 Sep 2008 03:23:39 +0000</pubDate>
		<guid isPermaLink="false">http://www.whiteroofradio.com/?p=922#comment-43489</guid>
		<description>&lt;p&gt;Nice coverage of the Magical Mystery Mini Tour. I guess that does not merrit any WRR attention.&lt;/p&gt;
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		<content:encoded><![CDATA[<p>Nice coverage of the Magical Mystery Mini Tour. I guess that does not merrit any WRR attention.</p>]]></content:encoded>
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		<title>By: Kevin</title>
		<link>http://www.whiteroofradio.com/woofcast-268/comment-page-1/#comment-43479</link>
		<dc:creator>Kevin</dc:creator>
		<pubDate>Mon, 08 Sep 2008 23:12:08 +0000</pubDate>
		<guid isPermaLink="false">http://www.whiteroofradio.com/?p=922#comment-43479</guid>
		<description>&lt;p&gt;I agree with commenting in the same spirit that the experiment was run...&lt;/p&gt;

&lt;p&gt;And, it so happens, it is possible to convert engine thrust into a measurement of horsepower, so long as you are able to fill in a few variables.  This is explained below, using the example of a Boeing 747:&lt;/p&gt;

&lt;p&gt;The conclusion of this explanation is that in order to determine the power a jet creates in flight, we need to know the exact amount of thrust necessary to fly at a particular speed. We typically know the static thrust rating of an engine or the airspeed of a plane during flight, but the problem is that we usually don&#039;t know the amount of thrust that corresponds to a particular speed at a specific point in time. It is because of this disconnect that it is so difficult to calculate the power generated by the engines on a particular plane.&lt;/p&gt;

&lt;p&gt;Luckily, we do have access to data from a NASA report that does provide all the data we need to illustrate a sample case. The data is provided for a Boeing 747-200 cruising at Mach 0.9 at 40,000 ft (12,190 m). In this example, the aircraft&#039;s engines produce 55,145 lb (245,295 N) of thrust, only a quarter of its rated static thrust, to cruise at a velocity of 871 ft/s (265 m/s). Using the equations provided above, we calculate the power generated by the 747 to be 87,325 hp (65,100 kW).&lt;/p&gt;

&lt;p&gt;For the full story about thrust and horsepower, see: http://www.aerospaceweb.org/question/propulsion/q0195.shtml&lt;/p&gt;
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		<content:encoded><![CDATA[<p>I agree with commenting in the same spirit that the experiment was run&#8230;</p>

<p>And, it so happens, it is possible to convert engine thrust into a measurement of horsepower, so long as you are able to fill in a few variables.  This is explained below, using the example of a Boeing 747:</p>

<p>The conclusion of this explanation is that in order to determine the power a jet creates in flight, we need to know the exact amount of thrust necessary to fly at a particular speed. We typically know the static thrust rating of an engine or the airspeed of a plane during flight, but the problem is that we usually don&#8217;t know the amount of thrust that corresponds to a particular speed at a specific point in time. It is because of this disconnect that it is so difficult to calculate the power generated by the engines on a particular plane.</p>

<p>Luckily, we do have access to data from a NASA report that does provide all the data we need to illustrate a sample case. The data is provided for a Boeing 747-200 cruising at Mach 0.9 at 40,000 ft (12,190 m). In this example, the aircraft&#8217;s engines produce 55,145 lb (245,295 N) of thrust, only a quarter of its rated static thrust, to cruise at a velocity of 871 ft/s (265 m/s). Using the equations provided above, we calculate the power generated by the 747 to be 87,325 hp (65,100 kW).</p>

<p>For the full story about thrust and horsepower, see: <a href="http://www.aerospaceweb.org/question/propulsion/q0195.shtml" rel="nofollow">http://www.aerospaceweb.org/question/propulsion/q0195.shtml</a></p>]]></content:encoded>
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		<title>By: dickdavid</title>
		<link>http://www.whiteroofradio.com/woofcast-268/comment-page-1/#comment-43478</link>
		<dc:creator>dickdavid</dc:creator>
		<pubDate>Mon, 08 Sep 2008 22:48:56 +0000</pubDate>
		<guid isPermaLink="false">http://www.whiteroofradio.com/?p=922#comment-43478</guid>
		<description>&lt;p&gt;Wow. Take it easy there, TJ. Your post comes off as a little harsh.&lt;/p&gt;

&lt;p&gt;I get the feeling Todd&#039;s little experiment was done for the fun of it, and I don&#039;t think Boeing is going to redesign their planes based on the data he pulled.&lt;/p&gt;
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		<content:encoded><![CDATA[<p>Wow. Take it easy there, TJ. Your post comes off as a little harsh.</p>

<p>I get the feeling Todd&#8217;s little experiment was done for the fun of it, and I don&#8217;t think Boeing is going to redesign their planes based on the data he pulled.</p>]]></content:encoded>
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		<title>By: davester</title>
		<link>http://www.whiteroofradio.com/woofcast-268/comment-page-1/#comment-43466</link>
		<dc:creator>davester</dc:creator>
		<pubDate>Mon, 08 Sep 2008 16:29:13 +0000</pubDate>
		<guid isPermaLink="false">http://www.whiteroofradio.com/?p=922#comment-43466</guid>
		<description>&lt;p&gt;it was good to see Spec Rhodes playing the upright   base again&lt;/p&gt;
</description>
		<content:encoded><![CDATA[<p>it was good to see Spec Rhodes playing the upright   base again</p>]]></content:encoded>
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	<item>
		<title>By: TJ</title>
		<link>http://www.whiteroofradio.com/woofcast-268/comment-page-1/#comment-43442</link>
		<dc:creator>TJ</dc:creator>
		<pubDate>Mon, 08 Sep 2008 03:35:38 +0000</pubDate>
		<guid isPermaLink="false">http://www.whiteroofradio.com/?p=922#comment-43442</guid>
		<description>&lt;p&gt;Hey Todd,&lt;/p&gt;

&lt;p&gt;Stick to cars!  Your knowledge of Jet engines is &quot;Zero&quot;.&lt;/p&gt;

&lt;p&gt;First Jet Engines aren&#039;t rated in bph.  They are rated in &quot;Pounds of Thrust&quot;.  Depending which Airline you flew on, most 737 use CFM56 Turbofan engines.  The CFM56 Engine has between 24,000 &amp; 32,000 pound of Thrust. (depends on engine config.)&lt;/p&gt;

&lt;p&gt;Second, the &quot;empty weight&quot; of 737 is 68,860 lb, then you have to add the weight of the engines, fuel, oil, hydraulic fluid, cargo, passengers, baggage, etc, etc.&lt;/p&gt;

&lt;p&gt;Max. take off weight of a 737 is 133,210 lb&lt;/p&gt;

&lt;p&gt;Takeoff thrust of CFM56 Turbofan Engine is appox. 20,000 lbf (per engine)&lt;/p&gt;

&lt;p&gt;Please leave the Aviation technical stuff to those us who actually work on Aircraft and Aircraft engines.  Stick to Mini&#039;s.&lt;/p&gt;
</description>
		<content:encoded><![CDATA[<p>Hey Todd,</p>

<p>Stick to cars!  Your knowledge of Jet engines is &#8220;Zero&#8221;.</p>

<p>First Jet Engines aren&#8217;t rated in bph.  They are rated in &#8220;Pounds of Thrust&#8221;.  Depending which Airline you flew on, most 737 use CFM56 Turbofan engines.  The CFM56 Engine has between 24,000 &amp; 32,000 pound of Thrust. (depends on engine config.)</p>

<p>Second, the &#8220;empty weight&#8221; of 737 is 68,860 lb, then you have to add the weight of the engines, fuel, oil, hydraulic fluid, cargo, passengers, baggage, etc, etc.</p>

<p>Max. take off weight of a 737 is 133,210 lb</p>

<p>Takeoff thrust of CFM56 Turbofan Engine is appox. 20,000 lbf (per engine)</p>

<p>Please leave the Aviation technical stuff to those us who actually work on Aircraft and Aircraft engines.  Stick to Mini&#8217;s.</p>]]></content:encoded>
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